At a glance
Electrotherapy is a group of physiotherapy treatments that use electrical currents or sound waves to reduce pain, relax muscles, and support tissue healing without surgery or injections. The two most common forms are TENS (Transcutaneous Electrical Nerve Stimulation) and therapeutic ultrasound, and they are often used together in a single session.
TENS works by sending mild electrical pulses through the skin via small electrode pads, which interfere with pain signals traveling to the brain and encourage the body to release endorphins (natural pain-relieving chemicals). Therapeutic ultrasound uses high-frequency sound waves, delivered through a handheld probe, to gently warm deep tissue, increase local blood flow, and speed up the repair of damaged muscles, tendons, and ligaments.
Medical Condition
Electrotherapy is used for a wide range of musculoskeletal (muscle, joint, and bone) conditions where pain relief, reduced inflammation, or faster tissue healing is the goal. A physiotherapist will choose TENS, ultrasound, or a combination based on the specific diagnosis and the depth of the tissue that needs treatment.
- Chronic (long-term) low back pain
- Neck pain and stiffness, including whiplash injuries
- Osteoarthritis (joint cartilage wear) of the knee, hip, or shoulder
- Tendinopathy (tendon damage or degeneration), such as tennis elbow or Achilles tendon pain
- Muscle strains and soft-tissue injuries in the recovery phase
- Frozen shoulder (adhesive capsulitis), where the shoulder joint stiffens over time
- Plantar fasciitis (heel pain caused by inflammation of the tissue along the sole of the foot)
- Post-surgical rehabilitation to manage swelling and regain movement
- Fibromyalgia (widespread chronic muscle pain) for symptom management
Electrotherapy is not suitable for everyone. A physiotherapist will avoid or modify it in several situations.
- Patients with an implanted pacemaker or any other active electronic implant
- Application over a cancerous (malignant) lesion or tumour site
- Use over broken or infected skin
- Placement over the abdomen or lower back during pregnancy
- Application directly over metal implants when using thermal (heat-producing) ultrasound settings
- Patients who cannot feel sensation in the area being treated, due to nerve damage
- Children, whose growing bone plates require special caution
Risks & Complications
Electrotherapy is generally considered low-risk, and serious complications are rare when it is applied by a trained physiotherapist. Most reactions are mild and temporary.
- Skin irritation or redness under the electrode pads, which usually fades within an hour
- A tingling, buzzing, or mild warming sensation during treatment, which some patients find uncomfortable
- Temporary increase in pain or soreness after the session, particularly with ultrasound applied to inflamed tissue
- Allergic skin reaction to the adhesive gel used with electrode pads, in sensitive individuals
- Minor burns from ultrasound if the probe is held still for too long on one spot, which a careful therapist avoids by keeping the probe moving
- In patients who cannot sense heat or pain normally, there is a slightly higher risk of tissue damage going unnoticed, which is why sensation testing is done beforehand
Preparation & Procedure
Electrotherapy sessions do not require fasting, and patients can eat and drink normally beforehand. There is no need to stop regular medications before the session, although the physiotherapist should know about any blood thinners, skin-sensitising drugs, or pain patches you use, because these can affect how the skin responds.
Smoking and alcohol do not directly affect the safety of the procedure, but both slow down tissue healing, so the physiotherapy team will usually encourage reducing or stopping them during the full course of treatment. Patients with diabetes or poor circulation should mention this at the first appointment, as these conditions affect how tissues respond to electrical and thermal stimulation.
Before the first session, the physiotherapist will typically carry out an assessment. This usually includes the following steps.
- A detailed review of your medical history and any existing conditions or implants
- A physical examination of the affected area, including range of movement and strength testing
- A skin sensation test to confirm you can feel warmth and touch in the treatment area
- A check for any open wounds, rashes, or skin infections at the electrode or probe sites
- Review of any recent imaging such as X-rays, MRI, or ultrasound scans, if available
On the day of treatment, the typical sequence of steps is as follows.
- The patient removes clothing to expose the treatment area and lies or sits in a comfortable position on the therapy table.
- The physiotherapist cleans the skin and applies conductive gel (for ultrasound) or adhesive electrode pads (for TENS) to the target area.
- The device is switched on at a low intensity and gradually adjusted based on the patient's feedback until a comfortable level is reached.
- The therapist moves the ultrasound probe in small circular strokes over the area, or leaves the TENS electrodes in place, for the prescribed duration. This is usually between ten and thirty minutes depending on the condition.
- At the end of the session, the gel is wiped away, the pads are removed, and the skin is checked for any reaction.
- The physiotherapist discusses how the area feels and adjusts the plan for the next session if needed.
Aftercare
Recovery after each electrotherapy session is immediate for most patients, and there is no need for bed rest or a hospital stay. A mild ache or warmth in the treated area for a few hours afterward is normal and usually settles on its own.
- You can return to light daily activities directly after the session. Heavy lifting or vigorous exercise should wait until the physiotherapist clears you.
- Keep the treated skin clean and avoid applying creams, heat pads, or ice packs to the area for at least a few hours, unless the physiotherapist specifically recommends them.
- If redness or irritation from the electrode pads persists beyond a few hours, mention it at the next session so the therapist can try a different gel or pad type.
- Electrotherapy is rarely a single session. Most courses involve multiple visits spread over several weeks, and the physiotherapist will adjust the settings and technique as the condition improves.
- Home exercises prescribed alongside the sessions are a core part of recovery. Doing them consistently tends to produce better results than therapy alone.
- Follow-up appointments let the physiotherapist measure progress. If pain is not improving after a reasonable number of sessions, the team will reassess the diagnosis and discuss other options with your doctor.
Cost & What Determines It
The cost of electrotherapy varies widely depending on where it is done, how many sessions are needed, and whether it is combined with other physiotherapy techniques in the same visit. Because this is a hands-on, therapist-led service rather than a single procedure in an operating theatre, pricing is structured differently from surgical care.
- Number of sessions in the course: a short course for an acute (sudden) injury differs significantly in total cost from a long-term program for a chronic condition
- Type of facility: a private specialist physiotherapy clinic, a hospital-based rehabilitation department, and a community health centre charge at very different rates
- Country of treatment: therapist fees, equipment maintenance costs, and clinic overheads differ substantially between countries
- Whether TENS, ultrasound, or both are used in each session, as some facilities charge per modality
- Additional hands-on techniques combined in the session, such as manual therapy or dry needling, which are usually billed separately
- Assessment and re-assessment fees, which may be charged as separate appointments from treatment sessions
- Cost of any take-home TENS device if the physiotherapist recommends one for use between sessions
A physiotherapy package at a hospital or clinic abroad typically includes a set number of sessions and the use of the clinic's equipment during those sessions. Items such as disposable electrode pads, conductive gel, printed home exercise programmes, or a personal TENS unit to keep are often charged separately. Always ask for a written breakdown before committing to a package.
BPJS Kesehatan and most Indonesian private insurance plans do not cover physiotherapy received outside Indonesia, so patients travelling abroad for this treatment usually pay fully out of pocket or through international private health insurance that explicitly covers outpatient rehabilitation abroad. Requesting a detailed written cost estimate from the clinic before you travel is the most reliable way to avoid unexpected bills on arrival.
Frequently Asked Questions
How many sessions of electrotherapy will I need?
The number of sessions varies depending on your condition and how well your body responds to treatment. Most people attend somewhere between 6 and 12 sessions, though some acute (short-term) problems may improve sooner and chronic (long-standing) conditions may need more. Your physiotherapist will reassess your progress regularly and adjust the plan.
What does electrotherapy actually feel like during the session?
Most people describe TENS as a mild tingling or buzzing sensation on the skin, while ultrasound therapy often feels like gentle warmth deep in the tissue. Neither should be painful, and the intensity is always adjusted to stay within your comfort level. Let your therapist know immediately if anything feels sharp or uncomfortable.
How soon will I feel relief after starting electrotherapy?
Some people notice reduced pain or looser muscles after just a few sessions, but lasting improvement usually builds up over several weeks of consistent treatment. Results depend on the type and severity of your condition, as well as other therapies you may be doing alongside it. Your physiotherapist can give you a more realistic timeline once they have assessed you.
How much does electrotherapy cost?
The cost depends on the number of sessions prescribed, whether TENS or ultrasound (or both) are used, and the class of the physiotherapy clinic or hospital. A package of multiple sessions is often priced differently from paying per visit. Requesting a written treatment plan and cost estimate from the facility is the most reliable way to know what to budget.
This page is general information, not a substitute for medical advice. Every case is different. Your doctor decides what is right for you.
